- #1
laguna
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Homework Statement
Hi, I want to apologize for any grammar errors in advance since english is not my first language. But i hope it is good enough such that the question is clear:
I want to calculate the velocity of a Helium-atom after it scattered on a double slit. The following information are given:
1) the distance of the first intensity maximum from the axis of the detector screen
2) distance d between both slits
3) distance from the double slit and the detector screen
Homework Equations
what is the velocity of the helium-atom? and what velocity would an electron need to have to reach the same separation of its intensity maximum?
The Attempt at a Solution
1) first I calculated the condition for constructive interference: d*sin(phi)=n*lamba, n integer.
2) from the distance to the screen L, and the distance of the first maximum, say l, we get phi: tan(phi)=l/L
3) from the first step we get lambda, since n=1, right?.
And here i am stuck.
Thank you.